An Unstable Radioactive Isotope Decays According to the Equation $y=2.53(.97)^{t}$ Where $y$

Multiple Choice

An unstable radioactive isotope decays according to the equation $y=2.53(.97) ^{t}$ where $y$ is the number of grams remaining and $t$ is the time measured in minutes. Match each question with one of the solutions A, B, C, or D.
-How long will it take for the material to decay to 2 grams?

A) Evaluate $2.53(.97) ^{1 / 2}$
B) Evaluate $2.53(.97) ^{2}$
C) Solve $2=2.53(.97) ^{t}$
D) Solve $\frac{1}{2}(2.53) =2.53(.97) ^{t}$